PYTHON: time performance

timeseqs.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-

import sys
import time


reps = 1000
repslist = range(reps)


def timer(func, *pargs, **kargs):
    start = time.clock()
    for i in repslist:
        ret = func(*pargs, **kargs)
    elapsed = time.clock() - start
    return (elapsed, ret)


def forLoop():
    res = []
    for x in repslist:
        res.append(abs(x))
    return res


def listComp():
    return [abs(x) for x in repslist]


def mapCall():
    return list(map(abs, repslist))
    # Вызов list необходим только в 3.0


def genExpr():
    return list(abs(x) for x in repslist)  # Функция list вынуждает
    # вернуть сразу все результаты


def genFunc():
    def gen():
        for x in repslist:
            yield abs(x)
    return list(gen())


print(sys.version)
for test in (forLoop, listComp, mapCall, genExpr, genFunc):
    elapsed, result = timer(test)
    print ('-' * 33)
    print ('%-9s: %.5f => [%s...%s]' %
           (test.__name__, elapsed, result[0], result[-1]))